Fluid-operated drill



` `C. A. HULTQUIST FLUID QPERATED DRILL Filed April 2l, 1919 Patentedpr. 24, 1923.

errantes A. HULTQUIST, or Los Antennas, cAmrenNr/L FLUID-ornrtnrnnDRILL.

Application filled April 21, .1919.` Serial No. 291,510.

' To all tow/tom t may concern.'

' Fig. i.

Be it knownthat I, CHARLES A.` HULr- Quisr, a citizen ofthe UnitedStates, residing at Los Angeles, in. thecounty of Los Angeles and State.ofvCaliiornim have invented a new vand useful Fluid-Operated Drill, ofwhich the'following is a specification. This invention relates to drillsof the type operated by compressed iluid, such as air, and an object ofthe invention, in general, is to provide a drill off this type inwhich'the compressed fluid reciprocates the plunger and'also effectsturning oi thedrill steel.

Another object iskto make provision for turning lthe drillsteelconstantly while the plunger is reciprocating.l

Anotherobject is to make provision for controlling the'reciprocation oithe plunger alone, or simultaneous reciprocation of the plunger'andturning oi the drill steel, by;l operation 'oi a single control:me`mberinto twov different positions.

Other objectsand advantages will appear in the subjoined` detaileddescription. The accompanying drawings illustrate the invention:

' Figure 1 is a yside ele'vation'of af drill' constructed in accordancewith the provisions of this invention, a drill steel also being shown.Fig. 2 is an enlarged elevation mainly in vertical section on lineindicated by a02-m2,

Fig. 3 is an enlarged sectional elevation on line indicated hyves-w3,Fig. l. 'y Fig. 1 is yan elevationfrom the right voi? Fig.` 2, thethrottle valve chamber, gear [housing and a portion oi the throttlevalve being `shown in` 4section* 'for clearness .of illustration.' v. lY

Fig. 5.*1s a plan view partly 1n 'section on lineyindicate.d `5x5, Fig.l, a portionof thev gear lhousing being partly: broken away to contractthe view.

Fig. 6 is ya fragmentary V.sectional elevation on line indicated by @vs-m6,' Fig. 4. Y

Fig. 7 4is a side elevation ofthe throttle valve. y y l e y There islprovided av cylinder 1 which is closed lat its opposite ends' byheads2and3. The cylinder l is provided witha plunger 4 Ahaving'a portion5 of reduced .diameter pass ing [through an opening 6 'in the head, theAreducedportion being adapted to strike an yanvil 7 which isreciprocatively ymounted .inI

the bore 8 of a tubular shaft 9, the plunger kportion 5 being adaptedlto project into the bore 8 when the plunger is moved away trom the head2. The anvil 7 is adapted to engagetheinner endoi the drill steel `10``'which lsprovided with a portion 11 of an- Aconnected'with' the head3,-in this instance said .bearing being integral with the head. '.lheouter portion oi the shaft 9 is journaled in a bearingl l11 that hasanend wall 15 provided with an opening 16 through which the drill steelloextends.

Fixed 'to the shai'tl v9 by suitable means, suoli as a ylrey 17, is aworm gear 18`which is accommodated in a housing v19 thatfmay be formedintegral with'k the bearing 14 as shown in the drawings. lThe housing 19fits a rabbet 20 formed in the outer end of the bearing 13. Theworm gear18- meshes with a worm 21 on a shaft'22 which is journaled at itsopposite ends and intermediate'ly in bearings 23, 24,24! of the housing19. The bearingy 23 is'closed yatits "outer end by a plug 25 screwthreaded thereinto, therebeing a thrust bearing or washer 26 between theplug 25 and they adjacent end of the shaft 22.

7 The shaft 22 is provided with airotor in the form of a spur-gear 27vthat mesheswith a spur gear 28 mounted on a lshaft 29.r The shaft 29v isjonrnaled at its opposite yends in bearings 30, 310i the housing`19. Thehous-j' and consequently produce rotation yor the drill ksteel 10. Themotor is operated lby compressed iluid admitted through a port 34:

loi' the chamber in which `the gears27, 28 lsubstantially lit. Theport/311 is at one side of ythe line of engagement of the gears l27, 28withone another so that the luidjadmitted through the port 34:'willcause the gear 27 to turnin the direction'of the arrow a in Figf 3. Theport 34 communicatesy through a duct 36 with a' throttle valve chamber37,A

'formed in the housing 19, partly inthe'bearl Aformed by the head 2,'said' duct being partly ing -iarruy in the-head '3, partly iin fhefcylinder 1 and partly in the head 2. The

`exhaust of luid from the chamber takes pered throttle valve 38 having`ports 39, 40

ves

arranged in di tl'erent planes longitudinally of the throttle valve.rlhe port 39 may be brought into registration with the duct 36 and theport 40 may be brought intoregistration with another duct 41 whichcommunicates with a port 42 or' avalve chamber 43. The valve chamber 43is provided with a sliding valve 44 adapted to be reciprocated by thecompressed fluid admitted through the port 42. The valve chamber 43 andvalve 44 may be of any suitable construction and need not be describedin detail herein since vt-heir specific constructions do not enter intothis invention. The valve shown is of a type well known in thev artpertaining to pneumatic drills. vrlfhe ports 39, 40 are of such sizesand are sov arranged peripherally of the throttle valve 38 that when thethrottle valve is turned to one positionbot-h ducts 36, 41 will beclosed, and when the throttle valve is turned to a second position theduct 41will communicate with the port 40 so as to cause reciprocation ofthe plunger 4, and when the throttle valve is turned to a third positionthe duct 41 will communicate with the port 4() and the duct 36 willcommuni- Cate with the port 39 s0 as to cause simultaneous reciprocationof the plunger 4 and rotation ofthe drillv steel 10. One end ot thevalve chamber 37 is closed by a tubular plug 45 screw threaded into saidvalve chamber and adapted to-be connected with the fluid-supply tube orhose. rlhe throttle valve 38 is provided with a stem 46 which projectsfrom theother end ot the valve chamber 37 and which is provided with acontrol member in the form oit an arm 47 whereby the throttle valve maybe rotated into the three different positionsI above described Jforshutting oil the compressed fluidL from the valve chamber 43, admittingthe compressed fluid only to the valve chamber 43, and admitting thecompressed fluid to both the valve chamber 43 and motor chamber 35. y

rlhe cylinder 1, heads 2 and-3, bearing 13 and housi'ng 19 are heldtogether by suitable 'means and in the instance shown in the drawinfrsthese holding means are con- 'structedB` as follows: The head 2 isprovided with perforated ears 4S to receive bolts 49 y which also passthrough perforated ears 50 projecting from the housing 19. Thus when thebolts 49 are tightened they cause the head 2 and housing 19 to be drawntoward one another so as to clamp the cylinder l and bearing 13 betweenthem.

. The invention operates as follows: When the operator desires toproduce blows on the-` 1,452,ese

drill steel 10, he Will turn the handle 47 to such position as to causeregistration of the port 40 and duct 41 so as to admit compressed lluidto the valve chamber 43. The valve 44 will be caused to reciprocate bythe admitted fluid in a manner well under stood in the art pertaining tofluid opcr ated drills so as to alternatively admit the compressed fluidat opposite ends of the cylinder 1 to drive the piston 4 lirst in onedirectionand then in the other so as to deliver a series ot' blows onthe anvil 7 which transmits the blows to the drill steel 10.

When the operator desires to also cause rotation of the drill steel l0,he will turn the handle 47 to the position shown in Figs. 2 and 6 ot thedrawings so as to cause registration, of not only the port 40 with theduct 41, but also of the port 39-with the duct 36, as clearly shown inFig. 4, so as to not only admit compressed fluid to the valve chamber 43to cause reciprocation of the plunger 4,. as just described, but to alsoadmit the compressed tluid to the motor chamber 35 to cause rotation ofthe gear 27 and thereby eil'ect turning of the worin 21, worm gear 18,shaft 9 and bushing 12, the rotation of the bushing in turn causingrotation ot the drill steel 1 0.

From lthe foregoing it is clear that by simply `turning one controlmember into two dilerent positions the separateoper-ation of the plunger4 or simultaneous operation of the plunger 4 and bushing 12 may beefected at will. l

lt is to be noted that the ports 39, 40 overlap peripherally of thevalve 38, and that the amount of the overlap is at least as great as thediameters of the ducts 36, 49 so that inpone position of the throttlevalve the ports 39, 40 are both at maximumdegree of opening; and sothat, when the throttle valve is turned clockwise in Fig. 6 from saidposition, the degree of opening of the port 40 will be graduallydiminished I while the degree of opening of the port 39 continues atmaximum; and so that, when the throttle valve is turned counterclockwise in Fig. 6 from said position, the degree of .opening of theport 39 will be gradually diminished while the degree of opening of theport 40 continues at maximum. A great The invention is notlimited in itsbroader phases to the exactvv details of construction described raboveand shown in the drawings,

- heads closingthe-opposite ends of the cylinder, one of the headshaving an opening, a plunger v1n the cylinder having a portion vofreduced diameter passing through the opening, a bearing formed integralwith the head having the opening, a tubular shaft having one end]ournaled 1n said bearing,

an anvil reciprocatvely mounted in the borev of the tubular shaft, thereduced plunger portion projecting into the bore of the shaft when theplunger is moved toward said anvil, a bushing screw threaded into theshaft and having a bore of angular cross section for the reception of -adrill steel, a Wormgear secured to the shaft, a housing for the Wormgear itting against the bearing, a second shaft journaled in thehousing, a Worm. on the shaft in meshwith the Worm gear,'a spur gear onthe second shaft inside of the housing, a third shaft journaled in thehousing,

a vspur gear .on the third shaft in mesh with the first spurgear, thehousing having a port to admit anl operatlng fluid, one of the headshaving a throttle valve chamber and there being a duct connecting theport' With said'chamber, a throttle' valve inthe chamber having ports, asecond valve chamber, and a Huid operated valve in the second valvechamber controllingthe flow of operating fluid toy and from thecylinder, there be ing a duct connecting the two valve chambers, thethrottle valve ports being positioned s0 that When the throttle valve isin one position both ductsk will he closed and'soy that When thethrottle valve is in a second position the second duct v villcommunicate With one of the valve ports and so that when the throttlevalve is in. a third position the second duct lWill communicate With thelast mentioned valve port and the first duct Will communicate With theother valve port. v i

Signed at Los Angeles, California, this 14th day of April, 1919.

y j CHARLES A. HULTQUIST.

Witnesses: f GEORGE H'. Hims, L. BELLE WEAVER.

